/* 
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System;

namespace Lucene.Net.Util
{
    
    /// <summary> An average, best guess, MemoryModel that should work okay on most systems.
    /// 
    /// </summary>
    public class AverageGuessMemoryModel:MemoryModel
    {
        public AverageGuessMemoryModel()
        {
            InitBlock();
        }

        private void  InitBlock()
        {
            sizes = new IdentityDictionary<Type, int>()
                        {
                            {typeof (bool), 1},
                            {typeof (byte), 1},
                            {typeof(sbyte), 1},
                            {typeof (char), 2},
                            {typeof (short), 2},
                            {typeof (int), 4},
                            {typeof (float), 4},
                            {typeof (double), 8},
                            {typeof (long), 8}
                        };
        }
        // best guess primitive sizes
        private System.Collections.Generic.Dictionary<Type, int> sizes;
        
        /*
        * (non-Javadoc)
        * 
        * <see cref="Lucene.Net.Util.MemoryModel.getArraySize()"/>
        */

        public override int ArraySize
        {
            get { return 16; }
        }

        /*
        * (non-Javadoc)
        * 
        * <see cref="Lucene.Net.Util.MemoryModel.getClassSize()"/>
        */

        public override int ClassSize
        {
            get { return 8; }
        }

        /* (non-Javadoc)
        * <see cref="Lucene.Net.Util.MemoryModel.getPrimitiveSize(java.lang.Class)"/>
        */
        public override int GetPrimitiveSize(Type clazz)
        {
            return sizes[clazz];
        }
        
        /* (non-Javadoc)
        * <see cref="Lucene.Net.Util.MemoryModel.getReferenceSize()"/>
        */

        public override int ReferenceSize
        {
            get { return 4; }
        }
    }
}